#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<assert.h>
int my_strlen(const char* str)
{
	int len = 0;
	assert(str!=NULL);
	
	while (*str!='\0')
	{
		str++;
		len++;
	}
	return len;
}
int main()
{
	char arr[] = "abcdefjk";
	printf("%d\n", my_strlen(arr));
	return 0;
}